Java中的 PrintStream close() 方法及示例
Java中PrintStream类的close()方法用于关闭流。关闭流会释放其中的任何值或与之关联的任何资源。 PrintStream 实例一旦关闭将不起作用。此外,一旦关闭的 PrintStream 实例也无法再次关闭。
句法:
public void close()
参数:此方法不接受任何参数。
返回值:此方法不返回任何值。它只是关闭流。
下面的方法说明了 close() 方法的工作:
方案一:
// Java program to demonstrate
// PrintStream close() method
import java.io.*;
class GFG {
public static void main(String[] args)
{
// The string to be written in the Stream
String str = "GeeksForGeeks";
try {
// Create a PrintStream instance
PrintStream stream
= new PrintStream(System.out);
// Write the above string to this stream
// This will put the string in the stream
// till it is printed on the console
stream.print(str);
// Now close the stream
// using close() method
stream.close();
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
GeeksForGeeks
方案二:
// Java program to demonstrate
// PrintStream close() method
import java.io.*;
class GFG {
public static void main(String[] args)
{
try {
// Create a PrintStream instance
PrintStream stream
= new PrintStream(System.out);
// Write the char to this stream
// This will put the char in the stream
// till it is printed on the console
stream.write(65);
// Now close the stream
// using close() method
stream.close();
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
A